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<pre><span class="comment"> /****************************************************************************
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 ** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
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 #include &quot;svgalibscreen.h&quot;
 #include &quot;svgalibsurface.h&quot;

 #include &lt;QVector&gt;
 #include &lt;QApplication&gt;
 #include &lt;QColor&gt;
 #include &lt;QWidget&gt;

 bool SvgalibScreen::connect(const QString &amp;displaySpec)
 {
     Q_UNUSED(displaySpec);

     int mode = vga_getdefaultmode();
     if (mode &lt;= 0) {
         qCritical(&quot;SvgalibScreen::connect(): invalid vga mode&quot;);
         return false;
     }

     vga_modeinfo *modeinfo = vga_getmodeinfo(mode);

     QScreen::lstep = modeinfo-&gt;linewidth;
     QScreen::dw = QScreen::w = modeinfo-&gt;width;
     QScreen::dh = QScreen::h = modeinfo-&gt;height;
     QScreen::d = modeinfo-&gt;bytesperpixel * 8;
     QScreen::size = QScreen::lstep * dh;
     QScreen::data = 0;

     switch (depth()) {
     case 32:
         setPixelFormat(QImage::Format_ARGB32_Premultiplied);
         break;
     case 16:
         setPixelFormat(QImage::Format_RGB16);
         break;
     default:
         break;
     }

     const int dpi = 72;
     QScreen::physWidth = qRound(QScreen::dw * 25.4 / dpi);
     QScreen::physHeight = qRound(QScreen::dh * 25.4 / dpi);

     return true;
 }

 bool SvgalibScreen::initDevice()
 {
     if (vga_init() != 0) {
         qCritical(&quot;SvgalibScreen::initDevice(): unable to initialize svgalib&quot;);
         return false;
     }

     int mode = vga_getdefaultmode();
     if (vga_setmode(mode) == -1) {
         qCritical(&quot;SvgalibScreen::initialize(): unable to set graphics mode&quot;);
         return false;
     }

     if (gl_setcontextvga(mode) != 0) {
         qCritical(&quot;SvgalibScreen::initDevice(): unable to set vga context&quot;);
         return false;
     }
     context = gl_allocatecontext();
     gl_getcontext(context);

     vga_modeinfo *modeinfo = vga_getmodeinfo(mode);
     if (modeinfo-&gt;flags &amp; IS_LINEAR)
         QScreen::data = vga_getgraphmem();

     QScreenCursor::initSoftwareCursor();
     return true;
 }

 void SvgalibScreen::shutdownDevice()
 {
     gl_freecontext(context);
     vga_setmode(TEXT);
 }

 void SvgalibScreen::disconnect()
 {
 }

 void SvgalibScreen::exposeRegion(QRegion region, int changing)
 {
     QScreen::exposeRegion(region, changing);
     <span class="comment">//</span> flip between buffers if implementing a double buffered driver
 }

 void SvgalibScreen::solidFill(const QColor &amp;color, const QRegion &amp;reg)
 {
     if (depth() != 32 &amp;&amp; depth() != 16) {
         if (base())
             QScreen::solidFill(color, reg);
         return;
     }

     const QVector&lt;QRect&gt; rects = (reg &amp; region()).rects();
     for (int i = 0; i &lt; rects.size(); ++i) {
         const QRect r = rects.at(i);
         gl_fillbox(r.left(), r.top(), r.width(), r.height(), color.rgba());
     }
 }

 void SvgalibScreen::blit(const QImage &amp;img, const QPoint &amp;topLeft,
                          const QRegion &amp;reg)
 {
     if (img.format() != pixelFormat()) {
         if (base())
             QScreen::blit(img, topLeft, reg);
         return;
     }

     const QVector&lt;QRect&gt; rects = (reg &amp; region()).rects();

     for (int i = 0; i &lt; rects.size(); ++i) {
         const QRect r = rects.at(i);
         gl_putboxpart(r.x(), r.y(), r.width(), r.height(),
                       img.width(), img.height(),
                       static_cast&lt;void*&gt;(const_cast&lt;uchar*&gt;(img.bits())),
                       r.x() - topLeft.x(), r.y() - topLeft.y());
     }
 }

 QWSWindowSurface* SvgalibScreen::createSurface(QWidget *widget) const
 {
     if (base()) {
         static int onScreenPaint = -1;
         if (onScreenPaint == -1)
             onScreenPaint = qgetenv(&quot;QT_ONSCREEN_PAINT&quot;).toInt();

         if (onScreenPaint &gt; 0 || widget-&gt;testAttribute(Qt::WA_PaintOnScreen))
             return new SvgalibSurface(widget);
     }
     return QScreen::createSurface(widget);
 }

 QWSWindowSurface* SvgalibScreen::createSurface(const QString &amp;key) const
 {
     if (key == QLatin1String(&quot;svgalib&quot;))
         return new SvgalibSurface;
     return QScreen::createSurface(key);
 }</pre>
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